Based on data from 265 vehicles, 19,569 fuel-ups and 7,476,311 miles of driving, the 2021 GMC Sierra 1500 gets a combined Avg MPG of 20.32 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (10) 3.0L L6 DIESEL (170) 4.3L V6 GAS (1) 5.3L V8 GAS (53) 6.2L V8 GAS (30) Any Body Style Extended Cab Pickup (6) Crew Cab Pickup (69) Cab & Chassis - Crew Cab (3) Any Submodel Base (1) SLE (10) SLT (38) Denali (47) Elevation (63) AT4 (106)

Below you can see a distribution of the fuel-ups with 104 outliers (0.53%) removed.

Following shows the average MPG of each of the 265 vehicles in the system.

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• Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 64 Fuel-ups

  Property of jameshawco

• 24.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2023 • 46 Fuel-ups

  Property of sharkyp14

• 16.0 Avg MPG

• 2021 Sierra 1500

  2021 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2021 • 133 Fuel-ups

  Property of yogi-bear

• 17.1 Avg MPG

• 21 Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Jul 2021 • 77 Fuel-ups

  Property of Corelax

• 22.2 Avg MPG

• Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Nov 2024 • 14 Fuel-ups

  Property of escape2004

• 19.7 Avg MPG

• Bigfoot

  2021 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2022 • 113 Fuel-ups

  Property of White-Denali

• 15.8 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 2.7L L4 GAS Automatic 8 Speed
  Added Aug 2021 • 119 Fuel-ups

  Property of johnoutdoors

• 21.7 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2023 • 68 Fuel-ups

  Property of snoogans7031

• 17.3 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 Elevation 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 69 Fuel-ups

  Property of dudecker

• 25.9 Avg MPG

• 21Elevation-X31

  2021 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Extended Cab Pickup
  Added Dec 2023 • 45 Fuel-ups

  Property of csfx8588

• 18.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 14 Fuel-ups

  Property of dillpill88

• 16.5 Avg MPG

• GMC

  2021 GMC Sierra 1500 SLT
  Added Jan 2023 • 124 Fuel-ups

  Property of builder604

• 16.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2022 • 48 Fuel-ups

  Property of mnm6080

• 24.1 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Nov 2024 • 239 Fuel-ups

  Property of AT4MPG

• 25.1 Avg MPG

• Caroline

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Feb 2023 • 43 Fuel-ups

  Property of Ryharris

• 21.9 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Aug 2023 • 5 Fuel-ups

  Property of Chrisb5597

• 25.6 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Oct 2023 • 120 Fuel-ups

  Property of gdmannjr

• 16.4 Avg MPG

• My Sierra 1500

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 48 Fuel-ups

  Property of stevengross

• 19.6 Avg MPG

• Steve's Sierra

  2021 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed Extended Cab Pickup
  Added Oct 2022 • 8 Fuel-ups

  Property of tosober

• 29.1 Avg MPG

• Stormtrooper AT4

  2021 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2023 • 28 Fuel-ups

  Property of SoCalEco14

• 19.5 Avg MPG

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